Maharaja Mangal Singh Prabhakar was the 6th Maharaja of Alwar (1874/1892) born 1859, adopted from Thikana Thana, installed upon the gaddi on 14 December 1874, in preference to Kunwar Lakhdir Singh of Bijwar, Maharaja cr.1889, G.C.S.I., married (amongst others),
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1937-1941: His Highness Raj Rishi Sri Sawai Maharaja Tej Singh Veerendra Shiromani Dev Bharat Prabhakar Bahadur, Maharaja of Alwar
1941-1943: Lieutenant His Highness Raj Rishi Sri Sawai Maharaja Tej Singh Veerendra Shiromani Dev Bharat Prabhakar Bahadur, Maharaja of Alwar
Sir Tej Singh Prabhakar KCSI (17 March 1911 – 15 February 2009) was the last ruling Maharaja of Alwar.